Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f652d2dbd2a957…

MALICIOUS

PDF

37.8 KB Created: 2020-09-07 02:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d43a343c4a4e1c5290e37f651b3271 SHA-1: 4f31596b9512eca6c95e5d8bbf03bca782119466 SHA-256: c6f652d2dbd2a957b513616a61bab24e81f2200e6d7bd9820f2026a82dcb3156
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=cryptogenic+organizing+pneumonia+guidelines'. This URL is presented within the document body, disguised as medical guidelines, to entice users to click. The file also contains a large number of embedded links, many pointing to 'static.usrfiles.com', which is flagged as a link farm. The primary malicious IOC is the redirector URL.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=cryptogenic+organizing+pneumonia+guidelines
    • https://static.usrfiles.com/ugd/d8e941_39b6e6baf7d34255b792567d393b8072.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_afa1b792dcde4033b59ce66d339ef3f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1eeb1d42e4af45868d3c1e9680d850aa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/youtube_music_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/first_48_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/4084685920.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/remubixorevikemigido.pdf
    • https://static.usrfiles.com/ugd/13ae68_3bc7b9c02b704b2bbd77d43dc06d7a34.pdf
    • https://static.usrfiles.com/ugd/2f7815_38c8d3baa56941838e187b576c8e2914.pdf
    • https://static.usrfiles.com/ugd/26f730_ee81f7fb475f4779977221f369c6bb36.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000555a.bin
9f0c432e10b51ba1698c6d66fd6ad4b390e1790fe08400a3d217ac6b1b8e0d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555A 5452 bytes
font_01_sfnt_off000067de.bin
32c9d28ec7095f75b7b228ed880aa83fd9d6af51f8fbc116b013f336a0a4423a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 10148 bytes

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